Tractor-trailer tank



FIG. 1 is a right side elevational view of a tractor-trailer tank incorporating the new design;

FIG. 2 is the front side elevational view thereof;

FIG. 3 is the left side elevational view thereof;

FIG. 4 is the rear end elevational view thereof;

FIG. 5 is the top plan view thereof;

FIG. 6 is the right side elevational view of a second embodiment of the tractor-trailer tank of FIG. 1;

FIG. 7 is the front side elevational view of the second embodiment of FIG. 6;

FIG. 8 is the left side elevational view of the second embodiment of FIG. 6;

FIG. 9 is the rear end elevational view of the second embodiment of FIG. 6; and,

FIG. 10 is the top plan view of the second embodiment of FIG. 6. 

The ornamental design for a tractor-trailer tank, as shown and described. 